<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
      <!-- 添加分类按钮 -->
      <el-row>
        <el-col>
          <el-button type="primary" @click="showAddCateDialog">添加分类</el-button>
        </el-col>
      </el-row>
      <!-- 表格区域 -->
      <tree-table
        :data="cateList"
        :columns="columns"
        :selection-type="false"
        :expand-type="false"
        show-index
        index-text="#"
        border
        :show-row-hover="false"
        class="treeTable"
      >
        <template slot="isok" slot-scope="scope">
          <i
            class="el-icon-success"
            style="color: lightgreen"
            v-if="scope.row.cat_deleted === false"
          ></i>
          <i class="el-icon-error" style="color: red" v-else></i>
        </template>
        <template slot="order" slot-scope="scope">
          <el-tag size="small" v-if="scope.row.cat_level === 0">一级</el-tag>
          <el-tag size="small" type="success" v-else-if="scope.row.cat_level === 1">二级</el-tag>
          <el-tag size="small" type="warning" v-else>三级</el-tag>
        </template>
        <template slot="opt" slot-scope="scope">
          <el-button size="small" icon="el-icon-edit" type="primary" @click="showEditDialog(scope.row.cat_id)">编辑</el-button>
          <el-button size="small" icon="el-icon-delete" type="danger" @click="removeCate(scope.row.cat_id)">删除</el-button>
        </template>
      </tree-table>
      <!-- 分页区域 -->
      <el-pagination
        @size-change="handleSizeChange"
        @current-change="handleCurrentChange"
        :current-page="queryInfo.pagenum"
        :page-sizes="[3, 5, 10, 15]"
        :page-size="queryInfo.pagesize"
        layout="total, sizes, prev, pager, next, jumper"
        :total="total"
      ></el-pagination>
    </el-card>
    <!-- 添加分类对话框 -->
    <el-dialog title="添加分类" :visible.sync="showAddCateDialogVisible" width="50%" @close="addCateDialogClosed">
      <el-form :model="addCateForm" :rules="addCateFormRules" ref="addCateFormRef" label-width="100px">
        <el-form-item label="分类名称" prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级分类"> 
          <el-cascader
            v-model="selectedKeys"
            :options="parentCateList"
            :props="cascaderProps"
            @change="parentCateChanged"
            clearable
            size="small">
          </el-cascader>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="showAddCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCate">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 修改分类的对话框 -->
    <el-dialog title="修改分类" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
      <el-form :model="editForm" :rules="addCateFormRules" ref="editFormRef" label-width="100px">
        <el-form-item label="分类名称" prop="cat_name">
          <el-input v-model="editForm.cat_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editCateInfo">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>
<script>
export default {
  data() {
    return {
      // 商品分类查询条件
      queryInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5
      },
      // 商品分类数据
      cateList: [],
      // 商品分类数据总条数
      total: 0,
      // 表格列的定义
      columns: [
        {
          label: '分类名称',
          prop: 'cat_name'
        },
        {
          label: '是否有效',
          type: 'template',
          template: 'isok'
        },
        {
          label: '排序',
          type: 'template',
          template: 'order'
        },
        {
          label: '操作',
          type: 'template',
          template: 'opt'
        }
      ],
      // 添加分类对话框的显示隐藏
      showAddCateDialogVisible: false,
      // 添加分类提交表单
      addCateForm: {
        cat_name: '',
        cat_pid: 0,
        cat_level: 0
      },
      // 添加分类名称验证规则
      addCateFormRules: {
        cat_name: [
          { required: true, message: '请输入分类名称', trigger: 'blur' },
          {
            min: 3,
            max: 10,
            message: '分类名称长度在 3 到 10 个字符',
            trigger: 'blur'
          }
        ]
      },
      // 添加分类父级分类
      parentCateList: [],
      // 分类对话框级联选择器配置
      cascaderProps: {
        expandTrigger: 'hover',
        checkStrictly: true,
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 选中的父级分类id数组
      selectedKeys: [],
      // 修改对话框显示与隐藏
      editDialogVisible: false,
      // 修改对话框数据
      editForm: {}
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    // 获取商品分类数据
    async getCateList() {
      const { data: res } = await this.$http.get('categories', {
        params: this.queryInfo
      })
      if (res.meta.status !== 200)
        return this.$message.error('获取商品分类失败')
      this.cateList = res.data.result
      this.total = res.data.total
    },
    // 监听每页数据条数变化
    handleSizeChange(newSize) {
      this.queryInfo.pagesize = newSize
      this.getCateList()
    },
    // 监听页码变化
    handleCurrentChange(newPage) {
      this.queryInfo.pagenum = newPage
      this.getCateList()
    },
    // 获取父级类
    async showAddCateDialog() {
      const { data: res } = await this.$http.get('categories', {
        params: { type: 2 }
      })
      if (res.meta.status !== 200) return this.$message.error('获取父级商品分类失败')
      this.parentCateList = res.data
      this.showAddCateDialogVisible = true  
    },
    // 父级分类级联选中发生变化
    parentCateChanged() {
      if(this.selectedKeys.length > 0) {
        this.addCateForm.cat_pid = this.selectedKeys[this.selectedKeys.length - 1]
        this.addCateForm.cat_level = this.selectedKeys.length
      }else {
        this.addCateForm.cat_pid = 0
        this.addCateForm.cat_level = 0
      }
    },
    // 监听添加分类对话框关闭
    addCateDialogClosed() {
      this.$refs.addCateFormRef.resetFields()
      this.selectedKeys = []
      this.addCateForm.cat_level = 0
      this.addCateForm.cat_pid = 0
    },
    // 添加分类
    addCate() {
      this.$refs.addCateFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post('categories', this.addCateForm)
        if (res.meta.status !== 201) {
          this.$message.error('添加分类失败 ')
        }
        this.$message.success('添加分类成功')
        this.showAddCateDialogVisible = false
        this.getCateList()
      })
    },
    // 展示修改分类对话框
    async showEditDialog(id) {
      const { data: res } = await this.$http.get('categories/' + id)
      if (res.meta.status !== 200) return this.$message.error('分类查询失败')
      this.editForm = res.data
      this.editDialogVisible = true
    },
    // 监听修改分类对话框的关闭事件
    editDialogClosed() {
      this.$refs.editFormRef.resetFields()
    },
    // 修改分类
    editCateInfo() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put(
          'categories/' + this.editForm.cat_id,
          {
            cat_name: this.editForm.cat_name
          }
        )
        if (res.meta.status !== 200) return this.$message.error('修改分类失败')
        this.$message.success('修改分类成功')
        this.editDialogVisible = false
        this.getCateList()
      })
    },
    // 删除分类
    async removeCate(id) {
      const confirmResult = await this.$confirm(
        '此操作将永久删除该分类, 是否继续?',
        '提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }
      ).catch(err => err)
      if (confirmResult !== 'confirm') {
        return this.$message.info('已经取消删除')
      }
      const { data: res } = await this.$http.delete('categories/' + id)
      if (res.meta.status !== 200) return this.$message.error('删除分类失败')
      this.$message.success('删除分类成功')
      this.getCateList()
    }
  }
}
</script>
<style lang="less" scoped>
.treeTable {
  margin-top: 15px;
}
.el-cascader {
  width: 100%;
}
</style>